I have both and use them for differnent things. When I'm walking around where a casual walk or doing tasks around the house, I like the airpods. They are light, don't make my ears hurt after prolonged wear , and easy to pair with other Apple devices.
I use my QC35's when I need to block out conversations around me at work or on a plane, when I want higher sound quality, or when I need to plug into a device like my Xbox One controller for wireless game audio.
The use cases for these headphone do not intersect, so you should probably get both. Since I value noise isolation more than convenience, I voted for QC35's. Get those first and the airpods later if you need sound isolation.
It may seem weird, but I wear Airpods during my walk to work ( no driving!!! ) and then I switch to Bose after I get to my desk. I put the Airpods on if I take a walk during my break and when I leave the office to walk home.